The Satellite Temperature RecordSource: UAH monthly temperature record (dec 1978-may 2008). Graph truncated at May 2008 for analytical reasons which are beyond the scope of this post.
As well grounded climate skeptic bloggers we immediately become suspicious of this record because it shows a warming trend. We know that the surface record shows only Urban Heat Island bias and AC Unit Warming bias in this period. Yet neither of these effects will be picked up by satellites, so why do the satellites still show warming? Something is wrong.
The #1 tool of the avid skeptic is imagination. So lets put our imagination to use and gather together some seeds of doubt. With luck some of these seeds will survive to grow into full blown talking points.
How do ground radio and microwave transmissions affect the readings?
There is real warming (briefly) during a pacific El Nino event. But the satellite records show about 0.4C more warming than the surface records. This suggests they are exagerating any temperature rise, including the long term trend.
Now once we have discovered a problem like this, the correct course of action is to adjust the satellite temperature record to correctly take this into account. If we do this (dropping the trend down by 0.4C) then virtually all of the warming of the past 30 years in the satellite records is wiped out. We are obviously getting closer to the truth here.